Because new api already exists in libraries, but FilePath from base is still being used, which makes things worse (now your programs have all those conversions all over).

I like the idea with gradual deprecation warning, but it's not clear if it's feasible to implement.

27 черв. 2015 12:33 "Niklas Larsson" <metaniklas@gmail.com> пише:
Hi!

Instead of trying to minimally patch the existing API and still breaking loads of code, why not make a new API that doesn't have to compromise and depreciate the old one?

Niklas

Från: Herbert Valerio Riedel
Skickat: ‎2015-‎06-‎26 18:09
Till: libraries@haskell.org; ghc-devs@haskell.org
Ämne: Abstract FilePath Proposal

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Hello *,

What?
=====

We (see From: & CC: headers) propose, plain and simple, to turn the
currently defined type-synonym

  type FilePath = String

into an abstract/opaque data type instead.

Why/How/When?
=============

For details (including motivation and a suggested transition scheme)
please consult

  https://ghc.haskell.org/trac/ghc/wiki/Proposal/AbstractFilePath



Suggested discussion period: 4 weeks
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